Make life easy, search the forum.

Discuss Mapei primer G required? in the DIY Tiling Forum area at TilersForums. USA and UK Tiling Forum

Stan7

TF
Reaction score
3
Please checkout the following advertisement.
Please can anyone advise if Mapei primer G is required when using Mapei buildfix wall tile https://www.tilersforums.com/forums/tile-adhesive/ on newly (8 weeks ago) skimmed bathroom walls? Or can I just use the https://www.tilersforums.com/forums/tile-adhesive/ straight onto the plastered walls?

Thanks very much for any advice
 
Reaction score
396
Is this a ready mix? Should clearly state on the bucket if a primer is needed. Some tubbed adhesives are self priming. Have the walls been skimmed to a polish? If so I'd be giving them a rub over, dust off and prime.
 
Reaction score
396
Does it say self priming? Sorry I'm not familiar with mapei products. Generally speaking no harm will ever come from priming as long as it's absorbed by the plaster, it's there to aid adhesion.
 
OP
S

Stan7

TF
Reaction score
3
Sadly my mother in law bought the https://www.tilersforums.com/forums/tile-adhesive/ so I won't be able to check until tomorrow. She did tell me it doesn't mention using a primer but I thought using the primer could only help.

Thanks for your help, Rich
 
OP
S

Stan7

TF
Reaction score
3
whitebeam, so the primer is worth using as it will provide absorption for the https://www.tilersforums.com/forums/tile-adhesive/?
 
W

White Room

whitebeam, so the primer is worth using as it will provide absorption for the https://www.tilersforums.com/forums/tile-adhesive/?

The primer makes a barrier between surfaces, cement based https://www.tilersforums.com/forums/tile-adhesive/ to plaster for example and also reduces suction, tub https://www.tilersforums.com/forums/tile-adhesive/ is water based and air drying and needs absorption to dry.
 
OP
S

Stan7

TF
Reaction score
3
Had a look at some info regarding the primer and it is a "water-based synthetic resin primer for treating gypsum substrates prior to installing tiles with cementitious adhesives".

As the https://www.tilersforums.com/forums/tile-adhesive/ does not appear to be cementitious and I don't think the substrate can be classed as absorbent I don't think I will use the primer.
 
Reaction score
396
New plaster unless finished to a polish is very absorbent. Granfix Multifix along with the Ultra ready-mix tubs are self priming, most other tubs in my experience aren't. Personally I'd prime. I use sbr 4:1 on new plaster. I've seen acrylic tubbed addy just peal away from unprimed plaster.
 
Reaction score
396
Only if you over apply. In the short term you may find it takes a little longer to dry but when it does dry the bond will be stronger. I'm presuming you're fixing ceramics? What size are the tiles?
 
Reaction score
396
Then you should be all good to go. Leave it as long as you can before grouting and don't exceed the bed thickness. As @whitebeam said tubbed adhesives require air to dry so it's imperative you leave it as long as you can. Best of luck with it.
 
OP
S

Stan7

TF
Reaction score
3
Appreciate your help, Rich. It's been a good 15 years since I last did any tile but wanted to help out my mother in law as she has been through a tough time lately.
 

Reply to Mapei primer G required? in the DIY Tiling Forum area at TilersForums.com

Or checkout our tile training advice or the Tile Standards

This website is hosted and managed by www.untoldmedia.co.uk. Creating content since 2001.

New Tiling Questions

UK Tiling Forum Stats

Threads
66,601
Messages
866,708
Members
9,513
Latest member
05jtaylor
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock